const mysql = require("mysql");
const utils = require("./utils");
const metamgr = require("./metamgr");
const db = require("./db");

class OrderMgr {

  init() {
    this.fetching = false;
    this.fetchOrerTimer = setInterval(this.fetchOrder.bind(this), 3000);
  }

  async fetchOrder() {
    if (!this.fetching) {
      this.fetching = true;
      try {
        await this.internalFetchOrder();
      } catch(e) {
        console.log(e);
      } finally {
        this.fetching = false;
      }
    }
  }

  async internalFetchOrder() {
    let { err, rows} = await db.execQuery('SELECT * FROM version', []);
    console.log(err, JSON.stringify(rows));
  }

}

var _instance = new OrderMgr();

module.exports = _instance;